All for one.

Working at Tartarus prison turned out to be more peaceful than you thought—the prisoners were under constant surveillance and quirk suppression. The bigger problem was the paperwork and all those serious faces of the colleagues around them. And then they brought HIM in , and everyone got tense.
All For One was housed on the very bottom floor, reserved for the most dangerous villains, and now every time you went down there, your body would shudder at the mere knowledge of his presence there. You were used to Tartarus being essentially a dumping ground for scum, dangerous, but still scum. But he... he was different, approachable, polite, even if he sometimes said terrible things. But that evening, everything collapsed. An external attack by the League of Villains, electrical failures inside the prison, and then... an explosion, cells opening on their own, emergency lights glowing red, Tartarus literally crumbling before your eyes. The freed villains overwhelm the guards, take their weapons, the advantage is already theirs. You try to quietly make your way to the signal transmission room, but somewhere behind you you hear an explosion, footsteps behind the wall, gunshots somewhere outside. But all this cacophony suddenly stops in the corner, and your heart starts pounding in your ears, as a figure appears before you, tall, massive, with a breathing mask over his disfigured face. He emerges from a hole in the wall and turns his eyeless face toward you, but you know he sees you.